Adam J
Sunscreed Product Education program, Canadian Dermatology Association, University of Owwawa, Ontario, Canada.
J Cutan Med Surg. 1998 Jul;3(1):50-3. doi: 10.1177/120347549800300115.
Topical sunscreens have been used for many years on exposed areas (i.e., hands, face) to protect the skin from the damaging effects of ultraviolet radiation. Most people do not use sunscreens on their bodies when they are wearing clothes. An average weight cotton T shirt gives only a sun protection factor (SPF) of 7. This is inadequate protection when out of doors. Therefore, clothing with adequate sunscreening properties should be worn.
The purpose of this study is to identify the factors in clothing fabrics that contribute to or detract from blocking ultraviolet radiation and to recommend criteria for establishing a standard for sunprotective clothing.
The study involves a review of the dermatologic and textile literature to identify various factors in fabrics that contribute to blocking ultraviolet radiation through textiles.
For fabrics, the term ultraviolet protection factor (UPF) is used as the measure of ultraviolet radiation penetration through the fabric. The UPF of a fabric depends upon fiber content and weave, fabric colour, finishing processes, and the presence of additives. The performance of a fabric depends upon stretching, shrinkage, hydration, laundering, and wear of the fabric over time. Based upon these criteria the minimum CDA standard UPF for clothing should be 40 to 50+.
外用防晒霜多年来一直用于暴露部位（即手部、面部），以保护皮肤免受紫外线辐射的伤害。大多数人在穿着衣服时不会在身体上涂抹防晒霜。一件普通重量的棉质T恤的防晒系数（SPF）仅为7。在户外时，这种防护是不够的。因此，应穿着具有足够防晒性能的衣物。
本研究的目的是确定服装面料中有助于或不利于阻挡紫外线辐射的因素，并推荐制定防晒服装标准的标准。
该研究包括对皮肤病学和纺织文献的综述，以确定面料中通过纺织品阻挡紫外线辐射的各种因素。
对于面料，紫外线防护系数（UPF）一词用作衡量紫外线透过面料的指标。面料的UPF取决于纤维含量和编织方式、面料颜色、整理工艺以及添加剂的存在。面料的性能取决于随着时间的推移面料的拉伸、收缩、水化、洗涤和磨损情况。基于这些标准，服装的最低加拿大卫生部标准UPF应为40至50+。
